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Polymers 2018, 10(4), 451; https://doi.org/10.3390/polym10040451

The Role of Chain Molecular Weight and Hofmeister Series Ions in Thermal Aggregation of Poly(2-Isopropyl-2-Oxazoline) Grafted Nanoparticles

Institute for Biologically Inspired Materials, Department of Nanobiotechnology, University of Natural Resources and Life Sciences Vienna, Muthgasse 11, 1190 Vienna, Austria
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Received: 26 February 2018 / Revised: 10 April 2018 / Accepted: 14 April 2018 / Published: 17 April 2018
(This article belongs to the Special Issue Stimuli Responsive Polymers)
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Abstract

Thermoresponsive nanoparticles are promising smart materials for many applications. However, a rational design for applications requires a deeper understanding and experimental verification of the various parameters that influence the thermoresponsiveness of the spherical polymer brushes that define most of such nanomaterials. Therefore, we investigate superparamagnetic iron oxide nanoparticles (SPION) grafted with poly(2-isopropyl-2-oxazoline) (6–33 kg mol−1) by temperature-cycled dynamic light scattering and differential scanning calorimetry. The grafting of dense spherical polymer brushes leads to lower aggregation temperatures and transition enthalpies when compared with the free polymer. The transition enthalpy and temperature depend on the polymer shell size and structure. The addition of kosmotropic salts decreases the aggregation temperature following the Hofmeister series. View Full-Text
Keywords: poly(2-isopropyl-2-oxazoline); lower critical solution temperature (LCST); superparamagnetic iron oxide nanoparticles (SPION); thermoresponsive polymer; reversible nanoparticle aggregation; Hofmeister series; spherical polymer brush; dynamic scanning calorimetry (DSC); dynamic light scattering (DLS) poly(2-isopropyl-2-oxazoline); lower critical solution temperature (LCST); superparamagnetic iron oxide nanoparticles (SPION); thermoresponsive polymer; reversible nanoparticle aggregation; Hofmeister series; spherical polymer brush; dynamic scanning calorimetry (DSC); dynamic light scattering (DLS)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Schroffenegger, M.; Zirbs, R.; Kurzhals, S.; Reimhult, E. The Role of Chain Molecular Weight and Hofmeister Series Ions in Thermal Aggregation of Poly(2-Isopropyl-2-Oxazoline) Grafted Nanoparticles. Polymers 2018, 10, 451.

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